1. pH Determination of a Weak Acid What is the pH of a 2.90 M ethylamine (C2H5NH2) solution at 298 K?

What is the pH of a 2.90 M ethylamine (C2H5NH2) solution at 298 K? The basicity constant Kb for C2H5NH2 is Kc = 6.5 x 10E-4. a. 2.72 b. 12.41 c. 11.28 d. 1.59 e. 1.36 f. 11.10 g. 2.90 h. 12.64 The pH of a 2.1 M solution of a weak acid, HA, at 298K is 1.85. What percent of the acid has dissociated? a. 4.06 % b. 11.8 % c. 0.67 % d. 33.7 % e. 8.44 % f. 1.28 % g. 6.73% h. 0.41 % i. 12.8 % j. 3.37 % What is the pH of a 0.75 M NaOH solution at 60°C? The equilibrium constant Kw for water at 60°C (333 K) is 9.60 x 10E-14. a. 14.12 b. 13.88 c. 12.72 d. 0.30 e. 13.32 f. 14.62 g. 13.50 h. 0.12 i. 12.89 j. 14.30 0.40 moles of a diprotic acid, H2A, is dissolved in 250 mL of water. The Ka1 of this acid is 1.0 x 10E-5 and Ka2 is 1.0 x 10E-9. What is the concentration of the di-anion, [A^2-], in this solution (in M)? a. 1.0 x 10E-5 b. 1.0 x 10E-10 c. 4.0 x 10E-3 d. 1.6 x 10E-5 e. 1.0 x 10E-9 f. 3.2 x 10E-3 g. 2.0 x 10E-6 h. 1.3 x 10E-7 i. 3.2 x 10E-5 j. 4.0 x 10E-5 Which of the following acetate anions is the strongest base?a. CH2ICOO- b. CCl3COO- c. CF3COO- d. CH2BrCOO- e. CH2ClCOO- f. CHF2COO- g. CI3COO- h. CHCl2COO- i. CBr3COO- j. CH2FCOO- What is the pH at the equivalence point when 100 ml of 0.15 M hydrofluoric acid HF is titrated with 0.5 M sodium hydroxide NaOH at 298K? (Ka(HF) = 7.2 x 10-4 ) a. 7.0 b. 8.1 c. 5.9 d. 6.1 e. 7.9 f. 10.1 g. 8.9 h. 4.3 i. 7.4 j. 11.1 What is the pH at the stoichiometric point (end point) for the titration of 50 ml of 0.20 M methyl amine CH3NH2 (aq) with 0.20 M perchloric acid HClO4(aq)? For methyl amine (CH3NH2), Kb = 3.6 x 10^–4. a. 5.93 b. 2.37 c. 2.22 d. 5.78 e. 7.00 f. 8.22 g. 11.63 h. 9.56 i. 8.07 j. 11.78 At 298K, 125 ml of 0.60 M potassium hydroxide KOH is added to 175 ml of 0.40 M hydrochloric acid HCl. What is the final pH? a. 13.4 b. 1.4 c. 0.9 d. 12.2 e. 13.1 f. 2.2 g. 7.0 h. 0.6 i. 12.6 j. 1.8

Show more







Calculate Your Essay Price
(550 words)

Approximate price: $22

Calculate the price of your order

550 words
We'll send you the first draft for approval by September 11, 2018 at 10:52 AM
Total price:
$26
The price is based on these factors:
Academic level
Number of pages
Urgency
Basic features
  • Free title page and bibliography
  • Unlimited revisions
  • Plagiarism-free guarantee
  • Money-back guarantee
  • 24/7 support
On-demand options
  • Writer’s samples
  • Part-by-part delivery
  • Overnight delivery
  • Copies of used sources
  • Expert Proofreading
Paper format
  • 275 words per page
  • 12 pt Arial/Times New Roman
  • Double line spacing
  • Any citation style (APA, MLA, Chicago/Turabian, Harvard)

Our guarantees

Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.

Money-back guarantee

You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.

Read more

Zero-plagiarism guarantee

Each paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.

Read more

Free-revision policy

Thanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.

Read more

Privacy policy

Your email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.

Read more

Fair-cooperation guarantee

By sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.

Read more

Order your essay today and save 10% with the coupon code: best10